There is controversy over how dynamic/static a measure contrast is, and whether that would cause overexposure.
But aside from that, there's the issue of the size of the arc. Most industrial or hydroponic lighting has long arcs and corresponding long life 1000 watt lamps. 80mm or more is typical. While our triplets can focus a 25-40mm arc which 400w non-HQI lamps present it with, I don't think that the long arc of a longlife 1000w lamp will be effective.
I tracked down the 31mm arc OSRAM HQI-TS d/s lamp a while back, but eventually concluded that it would be too expensive. It's a stadium/spotlight lamp w/ a 6000 hour or so lifetime, good color rendering, the works. OSRAM's UK site mentions that it's the lamp used for the last Olympic games. But it's rather expensive - I concluded that I couldn't afford the $400 or so it would have come out to for lamp, ballast, and igniter, plus $100 for a 120v->240v transformer (only ballast it has runs on 240v). This was after I found a decently priced place to buy the lamp, the MSRP is apparently $700 something just for the lamp, and data was sketchy. If you want details, send me a PM.